title: Lysine biosynthesis in Rhodotorula glutinis: properties of pipecolic acid oxidase.
abstract: Pipecolic acid oxidase from Rhodotorula glutinis, which converts pipecolic acid to alpha-aminoadipic-delta-semialdehyde, an intermediate of the biosynthetic pathway of lysine, was purified 290-fold. The enzyme from the crude extract and purified preparation exhibited a molecular weight of approximately 43,000 and was composed of a single subunit. The purified enzyme was heat labile and exhibited a pH optimum of 8.5 and an apparent Km for L-pipecolic acid of 1.67 X 10(-3) M. L-Proline acted as a competitive inhibitor for the enzyme. The enzyme was inhibited by the sulfhydryl agents p-chloromercuribenzoate and mercuric chloride. The in vitro enzyme activity required oxygen and upon oxidation of pipecolic acid, oxygen was reduced to hydrogen peroxide.
mesh_terms: D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008239:Lysine / Q000096:biosynthesis*; D003904:Mitosporic Fungi / Q000201:enzymology*; D008970:Molecular Weight; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000302:isolation & purification / Q000378:metabolism*; D010875:Pipecolic Acids / Q000378:metabolism*; D012248:Rhodotorula / Q000201:enzymology*
chemical_list: D010875:Pipecolic Acids; D006861:Hydrogen Peroxide; D000587:Oxidoreductases Acting on CH-NH Group Donors; C032771:L-pipecolate dehydrogenase; C031345:pipecolic acid; D008239:Lysine